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Identity confidentiality method in radio communication system

  • US 5,889,861 A
  • Filed: 12/15/1995
  • Issued: 03/30/1999
  • Est. Priority Date: 01/12/1995
  • Status: Expired due to Fees
First Claim
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1. An identity confidentiality method in a radio communication system having at least one first radio station and a plurality of second radio stations, said first radio station at least possessing a public key, a public-key cryptography function which uses the public key and a plurality of identities of the respective second radio stations, each of said second radio stations possessing a public-key cryptography function which uses the public key and an identity for identifying the second radio station, said method comprising the steps of:

  • generating a time-varying public key in accordance with a predetermined function at said first radio station;

    repeatedly broadcasting, from said first radio station, the generated time-varying public key to all said second radio stations;

    enciphering an identity of each second radio station, at each said second radio station, with the broadcasted time-varying public key;

    at each second radio station, after enciphering its identity with the broadcasted time-varying public key, waiting for a possible call thereto; and

    at the first radio station, enciphering the identity corresponding to a second radio station to be called with the time-varying public key and paging the enciphered identity to all the second radio stations.

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